The word "fucktard" means the same thing as using "retard" in a derogatory (as opposed to merely descriptive) manner. But whereas "retard" has the connotation of an insult to people with an unfortunate medical condition, the word "fucktard" makes it clear that it's a lifestyle choice.

Even though the parking lot was packed, some fucktard had parked his new car across two parking spaces.

noun,
A person of unbelieveable, inexcuseable and indescribable stupidity. (Stupidity being defined as "knowing how and doing it wrong anyway")

NOT A CONTRACTION FOR "FUCKING RETARD"! Those who are truly "Retarded" are not responsible for their affliction. True Fucktards are 100% responsible for their situation and provide vast entertainment as they are usually blissfully unaware of their own Fucktardery. Most politicians for example.

One who would actually piss on a live transformer. One who would use a live .22 round for a fuse in their pickup truck "just cuz it fits" and then complain about it shooting them in the nuts.